# What are the causes of variation of air pressure?

## What are the causes of variation of air pressure?

Although the changes are usually too slow to observe directly, air pressure is almost always changing. This change in pressure is caused by changes in air density, and air density is related to temperature.

## What is the variation of air pressure?

Altitude variation Pressure on Earth varies with the altitude of the surface; so air pressure on mountains is usually lower than air pressure at sea level. Pressure varies smoothly from the Earth’s surface to the top of the mesosphere.

What are the two main reasons air pressure changes?

Air pressure is highest at sea level because the density of gases is highest in lower layers. Density changes due to the expansion and the air shrinks because of low temperature. Air pressure and height are reversely proportional to each other, which means air pressure decreases due to increase in height.

### How air pressure from place to place affects weather conditions?

Atmospheric pressure is an indicator of weather. When a low-pressure system moves into an area, it usually leads to cloudiness, wind, and precipitation. High-pressure systems usually lead to fair, calm weather.

### How are the variations in atmospheric pressure caused Class 9?

Answer: When the temperature increases and the air start to rise upwards. creating a low pressure area, but when the temperature decreases, the air start to sink downwards creating a high pressure area on land surface. So, the temperature and pressure are inversely related to one another.

Why is there a variation in the distribution of pressure in the atmosphere?

Why is there a variation in the distribution of pressure on the atmosphere? Air pressure depends upon the temperature, humidity and gravitational pull of an area. As these three factors varies from place to place because of this the air pressure also has a variation in its distribution around the globe.

## What and why is variation in atmospheric pressure with height?

At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels. Since most of the atmosphere’s molecules are held close to the earth’s surface by the force of gravity, air pressure decreases rapidly at first, then more slowly at higher levels.

## Why do wind system vary from place to place?

Due to gravity the air at the surface is denser and hence has higher pressure. At any elevation it varies from place to place and its variation is the primary cause of air motion, i.e. wind which moves from high pressure areas to low pressure areas.

Why variation in air pressure is essential for generation of winds?

Answer: The movement of air in the atmosphere produces wind or movement of air relative to a earth’s surface. Circulation in the atmosphere is caused by pressure differences primarily by uneven insolation. Air flows from area of higher pressure, where air sinks, to areas of lower pressure, where air rises.

### How air pressure and wind influence the weather condition of a place?

Answer: Wind carries moisture into an atmosphere, as well as hot or cold air into a climate which affects weather patterns. Wind travels from areas of high pressure to areas of low pressure. Additionally, heat and pressure cause the wind to shift direction.

### What is the movement of air caused by differences in pressure?

Movement of air caused by temperature or pressure differences is wind. Where there are differences of pressure between two places, a pressure gradient exists, across which air moves: from the high pressure region to the low pressure region.

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